import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login'
import Home from '../components/Home'
import Welcome from '../components/Welcome'
import Users from '../components/user/Users'


Vue.use(VueRouter)



const router = new VueRouter({
  routes:[
    {path:'/',redirect:'/login'},
    {path:'/login',component:Login},
    {path:'/home',component:Home,
    redirect:'/welcome',
    children:[
    {path:'/welcome',component:Welcome},
    {path:'/users',component:Users}

    ]}
    

  ]
})

//挂载路由导航守卫
router.beforeEach((to,from,next) => {
  //to 将要访问的路径
  // form 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  // next() 放行 next('/login') 强制跳转

  if (to.path === '/login') return next()
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if(!tokenStr) return next('/login')
  next()
})


export default router
